JPH11141125A - Concrete form removing time confirmation device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a concrete form removing time confirmation device capable of confirming an accurate form removing time in the execution of concrete work and reducing a construction period of time. SOLUTION: The form removing time confirmation device is so constituted that a detection signal is inputted in a micro-processor in the case a temperature is detected by a temperature sensor 3 every day, in that case, the day having a minus air temperature is warned by a warning buzzer 6, at the same time, it is displayed on a display 4, a detection signal of the minus temperature is outputted to a selective circuit consisting of a logical operation circuit so that it can not be inputted, and a switch is operated and is turned OFF. By the constitution, a detection signal of a temperature of the day having a plus air temperature is only inputted. Operations are performed by the micro-processor to calculate an integrating temperature, compressive strength is calculated by an experiment formula, relation between the integrating temperature and compressive strength is compared with a standard graph, the number of days necessary to obtain the same compressive strength, or a form removing scheduled time is found out while watching the display 4 or is perceived by hearing the sound of an information buzzer 5. By the constitution, after the form removing time is confirmed, a concrete form is removed when the time arrives at the age.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a concrete form removing time confirming apparatus, and more particularly to a concrete form removing method which can accurately know a form removing time in construction in a cold region and contributes to shortening a construction period. It relates to a timing confirmation device.

[0002]

2. Description of the Related Art When a mold is removed after placing concrete, the compressive strength is 5 N / mm when the average temperature is 10 ° C. or less.
It is assumed that ² or more is secured. Conventionally, the empirical rule removal time is determined in consideration of the construction magnetism. However, the empirical formula (I) is estimated in advance from past experience, or in rare cases. Performs an indoor experiment to determine the empirical formula (I), obtains the integrated temperature (° DD) at which the compressive strength of 5 N / mm ² appears from the empirical formula (I), and further calculates the integrated temperature in the general formula [I]. By substituting the temperature and the daily average temperature in the past several years, Z (wood age (days)) was predicted and determined by back calculation.

[0003]

[0004]

In the present invention, when concrete is poured in a cold region, cold concrete is used. However, when concrete is frozen in the initial stage of setting and hardening, it does not harden or has a predetermined strength. This measure is necessary because an obstacle to not being obtained occurs, and so-called initial frost damage occurs. Therefore, as a countermeasure, the period of cold concrete differs depending on the region, but usually, the integrated temperature M to be obtained for the outside air from the concrete injection until the 28th is 370 ° D ·
D or less. The average temperature during this period is 3.2
This is a temperature range in which AE concrete having a water cement ratio of about 60% has a strength deficiency of 25% or more compared to the case of standard curing of 20 ° C.

[0006] In reinforced concrete construction in cold regions,
For the period up to 28 days after the concrete is poured, the integrated temperature M obtained by the general formula [I] is 370 °.
In case of D ・ D or less, get the consent of the construction supervisor.
In the construction, it is necessary to pay close attention to daily weather information.

[0007]

Under such circumstances, not only the rule of thumb but also the method of using the integrated temperature as described above in the concrete driving work,
Using the average daily temperature, which is the past performance, in general formula [I],
The graph shows the relationship between the cumulative temperature and the compressive strength during the period when the cumulative temperature is 370 ° D · D or less, and it is a method of predicting the timing of removing the concrete formwork in a cold region from this relationship. At present, there is considerable difference and lack of accuracy. Therefore, if the present inventors know the daily temperature of the concrete construction site,
Note that the mold removal time can be determined fairly accurately.In this case, the above-mentioned integrated temperature is calculated by excluding days when the temperature at which initial frost damage may occur is low, that is, days when the temperature is negative. As a result, it was found that the concrete strength at the time of removing the form can be accurately known, and based on this finding, a device for confirming the time of removing the form was manufactured.

SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide a formwork removal time checking device that can know the exact formwork removal time and can shorten the construction time in concrete work, especially in cold regions. To provide.

[0009]

The above objects to be solved by the present invention can be achieved by the following inventions.

(1) A concrete mold removal timing confirmation device provided with a temperature sensor, a mold removal strength selection means, a microprocessor, a memory, a display, and a warning buzzer, wherein a temperature detection signal detected by the temperature sensor is provided. Is input to the microprocessor, the integrated temperature is calculated, the concrete strength is further calculated, and when the strength matches the form-removable strength by the form-removing-strength selecting means, a buzzer is notified, and A concrete form removal timing confirmation device, which is displayed on a display. (2) It further has a temperature selecting means and a warning buzzer, and selects a negative temperature detecting signal and a positive temperature detecting signal from the temperature detecting signals detected by the temperature sensor by the temperature selecting means. When the detection signal is a negative temperature detection signal, the warning buzzer warns, and the microprocessor does not input the temperature detection signal.If only the positive temperature detection signal is input, the integrated temperature is calculated. The concrete strength is calculated, and when the strength coincides with the form-removable strength by the form-removing-strength selecting means, a notice buzzer informs the user of the fact. The concrete form removal timing confirmation device for cold regions described in the above.

[0011]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described below, but the present invention is not limited only to these embodiments.

[0012] The concrete form removal timing confirmation device of the present invention comprises a temperature sensor, a form removal strength selecting means, a microprocessor, a memory, a display and a buzzer, and the detection signal of the temperature detected by the temperature sensor is provided. When input to the microprocessor, the integrated temperature is calculated, the concrete strength is further calculated, and when the strength matches the form-removable strength by the form-removing-strength selecting means, a buzzer informs and displays. When this device is installed at a concrete construction site, the temperature is measured every day over the curing period after the concrete is poured in, and it is calculated by a microprocessor to calculate the desired time for removing the formwork. Is calculated and displayed on the display and notified by the buzzer. Is determination timing off exactly, in which excellent effects that it is possible construction time.

[0013] The concrete mold removal timing checking apparatus of the present invention calculates the integrated temperature from the temperature and the curing time in a laboratory using the general formula [I], and calculates the integrated temperature and the measured concrete compressive strength. Using the obtained empirical formula (I), a graph of the integrated temperature and the compressive strength is created. The relationship between the integrated temperature and the compressive strength is input to a microprocessor as a reference value, a detection signal sensed by a temperature sensor is input to calculate the integrated temperature, and further the concrete strength is calculated, and this value is 5 N / mm ² The age at which the concrete form is exceeded can be determined, and the scheduled removal time of the concrete formwork can be determined. Then, the result is displayed on a display and is notified by a notification buzzer. The installer hears the buzzer sound, knows when to remove the concrete formwork, and starts work. As a result, the timing for removing the formwork can be ascertained with certainty, so that it is easy to draft a construction plan, and therefore, the construction period can be shortened.

Further, according to the present invention, when performing concrete work in a cold region, the compressive strength is not sufficiently developed when the temperature is low, and the compressive strength is hardly developed when the minimum temperature is negative on many days. It is difficult to determine when to remove the formwork. In the formwork removal timing checking device that uses this point in a cold region, the integrated temperature is calculated using the number of days excluding all days of low temperature where frost damage may occur in the age of wood in the general formula [I]. Therefore, it is a feature that accurate judgment can be made, and initial frost damage may occur if there are many days when the temperature becomes negative, but measures should be taken to prevent early frost damage quickly and in advance with a warning buzzer It is characterized by being able to do.

[0015]

The embodiment of the present invention will be described below. FIG. 1 is a block diagram showing a concrete form removing time confirming apparatus according to the present invention. In FIG. 1, examples of a temperature sensor used in the present invention include a thermocouple temperature sensor, a thermistor temperature sensor, an IC temperature sensor, a platinum-side temperature resistor sensor, a pressure sensor, and a magnetic temperature sensor. In the present invention, at the concrete construction site, the formwork removal timing confirmation device is installed, and when the temperature sensor 3 senses the temperature every day, the detection signal is input to the microprocessor,
At that time, the day of the temperature when the temperature becomes negative is warned by the warning buzzer 6 and displayed on the display.
The detection signal of the minus temperature is output to a selection circuit composed of a logic circuit so as not to be input at all, and the switch is operated to be turned off.

As a result, only the detection signal of the air temperature on the day of the positive air temperature is input, so that it is calculated by the microprocessor 1 to calculate the integrated temperature, and further, the compressive strength is calculated by the formula of the experimental formula (I). The relationship between the integrated temperature and the compressive strength is compared by comparing the graph of the integrated temperature and the compressive strength, which are the above-described standards, and whether the age of the material until the same compressive strength becomes the same, that is, whether the scheduled removal of the formwork is known while looking at the display 4. Alternatively, the user hears the sound of the report buzzer 5 and senses it. After confirming the timing of removing the formwork in this way, the concrete formwork is removed when the time comes. The selection circuit may include the selection circuit in a microprocessor, or may include a selection circuit separately from a semiconductor chip included in the microprocessor.

[0018]

FIG. 2 is a flowchart showing the operation of the apparatus for confirming the timing of removing the formwork of the present invention. In FIG. 2, the outside temperature is measured by the temperature sensor 3 to recognize whether the temperature is plus or minus. When the temperature is negative, a warning buzzer 6 sounds and a warning is issued. When the air temperature is positive, the integrated temperature is calculated, and further the concrete strength is calculated. Then, it is compared with the standard concrete strength,
When the strength matches the mold removal strength, display 4
And is notified by the notification buzzer 5. If the strength does not reach the mold removal strength, the process returns to the integrated temperature calculation again. The formwork removal time confirmation device of the present invention can thus accurately confirm the formwork removal time.

The cement for concrete used in the present invention is not particularly limited, but Portland cement, which has high strength, is preferably used in order to promote condensation and hardening. In addition, other cements can be used according to the purpose, and a manual is prepared according to the type of the cement and input to the computer in the form removal timing confirmation device, which is selected each time according to the construction area. be able to. In the past, it was necessary to pay close attention to daily weather information during construction, but this is not particularly necessary when using the concrete form removal timing confirmation device of the present invention.

[0021]

According to the present invention, there is provided a concrete form removing time confirming apparatus provided with a temperature sensor, a form removing strength selecting means, a microprocessor, a memory, a display, and a warning buzzer. When a detection signal of the temperature sensed by the temperature sensor is input to the microprocessor, the integrated temperature is calculated, the concrete strength is further calculated, and the strength is determined by the form removal strength selecting means to be a form removable strength. When it coincides, the buzzer informs and displays it on the display, so it is possible to accurately confirm the concrete form removal time,
The construction period can be shortened.

The apparatus for confirming the removal timing of a mold according to the present invention further includes a temperature selecting means and a warning buzzer, and the temperature detecting means detects a negative temperature detecting signal among the temperature detecting signals detected by the temperature sensor. And a positive temperature detection signal, and when these detection signals are negative temperature detection signals, a warning is given by the warning buzzer, and this temperature detection signal is not input to the microprocessor. When only the temperature detection signal is input, the integrated temperature is calculated, the concrete strength is further calculated, and when the strength matches the form-removable strength by the form-removing-strength selecting means, a notification buzzer notifies. This makes it possible to accurately check the timing for removing concrete formwork even in cold regions, making it easier to formulate a construction plan and thus shortening the construction period To become.

[Brief description of the drawings]

FIG. 1 shows a block diagram of a mold removal timing checking device of the present invention.

FIG. 2 is a flowchart showing the operation of the apparatus for confirming the timing of removing a formwork of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Microprocessor 2 Memory 3 Temperature sensor 4 Display 5 Information buzzer 6 Warning buzzer

Claims (2)

[Claims] 1. A concrete form removal timing confirmation device comprising a temperature sensor, a form detachment strength selecting means, a microprocessor, a memory, a display and a warning buzzer, wherein a temperature detection signal detected by the temperature sensor is provided. When input to the microprocessor, the integrated temperature is calculated,
Further, when the concrete strength is calculated, and when the strength coincides with the form-removable strength by the form-removing-strength selecting means, a buzzer informs and displays it on a display, and the concrete form-removing timing confirmation. apparatus. 2. The apparatus further comprises a temperature selecting means and a warning buzzer,
Among the detection signals of the temperature sensed by the temperature sensor by the temperature selection means, a detection signal of a negative temperature and a detection signal of a positive temperature are selected, and when these detection signals are detection signals of a negative temperature, If you warn with a warning buzzer, do not input this temperature detection signal to the microprocessor, and input only a positive temperature detection signal,
The integrated temperature is calculated, the concrete strength is further calculated, and when the strength matches the strength with which the form can be removed by the form removing strength selecting means, a notification buzzer notifies. For checking the timing of removing concrete formwork in cold regions.